Rudder



Patented Feb. 9, 1932 UNITED TTES RUDOLF WAGNER, OF HAMBURG, GERMANY RUDDER Application led July 17, 1930, Serial No. 468,695, and in GermanyvJanuary 27, 1928.

The present invention relates to a rudder with guide surfaces, which will be particularly simple to manufacture and particularly satisfactory in operation, the rudder being unsynimetrically constructed in cross section above and below the axis ot the shaft in a known manner tor the purpose of utilizing the twist of the screw race. The invention consists in the fact that notwithstanding this unsymmetricalconstruction both the rear edge and the front edge of the rudder are located exactly or approximately in the central plane of the ship, whether the rudder is made in one piece, that is to say, as a balanced rudder, or in two parts, that is to say, consisting of a stationary front part and of a movable part attached thereto. In the guide-surface rudders hitherto known or suggested there existed in this respect, partly in the case of the leading edge and partly in the case of the trailing edge, a comparatively marked relative swerving of the edges of the upper and lower guide-surface members, as a result of which, particularly of course at the front end of the rudder, an unfavourable engaging and tangential deflection of the core current, which, as is known, possesses the maximum amount of rotational energy and is therefore the most advantageous to utilize, was involved.

By the present invention this advantage is obviated owing to the Jfact that the leading edges are exactly or approximately in the' vertical central plane of the ship, and therefore the entering jet is gripped exactly in a rudder.

applies to the leading edge, in that the sheathing of the rudder, or an intervening rudder frame, can extend from top to bottom without swerving.

The invention is illustrated for the case of 5()k a balanced rudder in the accompanying drawings, in which Figure l is a side view, and

Figures 2, 8 and 4 are cross sections taken at various distances from the shaft axis.

Figure 5 is a front view of the rudder, and

Figure 6 a sectional elevation of the rudder on the line IV-IV in Fig. l, as seen from the front. v

The line A-B denotes the shaft axis, l the rudder, 2 the rudder spindle, 3 the frontor leading edge of the rudder, and t the rear or trailing edge. According to the invention these two edges, both front and rear, are exactly or approximately in the central plane of the ship, and the opposite curvatures of the parts of the rudder only affect the intervenino part.

In Figure 3, which is a section on the line III and III', the curved operative centre lines -7`o 5 and 5 of the profile are also shown, these centre lines coinciding at the front and rear,

6 and 7 denote the rudder frame, which is inserted in the front and rear ends of the Similarly the invention may also be constructed as a two-part rudder body, consisting of a stationary front portion and ot a movable portion connected therewith. p

l. A guide-surface rudder, consisting of a front edge substantially in the midship plane,

a rear edge likewise substantially in the midship plane, an upper'rudder body portion (A extending between .the said front and rear 185 edges curved out to one side above the axis of the shaft, and a lower rudder body portion curved out to the other side underneath the axis of the shaft.

2. A guidesurface rudder, consisting of a if frame member' at the front edge of the rudder substantially in the mdship plane, a frame member at the rear edge of the rudder like- Wise substantially in the midship plane, and 5 plating secured to the said frame members and forming on the hand av rudder body por tion curved out to one sideY above the axis of the shaft and on the other hand a rudder body portion curved out to the other side underheath the axis of the shaft.

In testimony whereof I have signed my name to this speciicaton.

RUDOLF WAGNER. 

